Volume 95, Number 4, August 2011
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 July 2011|
Electron pockets and pseudogap Dirac point in underdoped cuprate superconductors
Department of Physics, University of Guelph - Guelph, Ontario, Canada N1G 2W1
2 Guelph-Waterloo Physics Institute, University of Guelph - Guelph, Ontario, Canada N1G 2W1
3 Department of Physics and Astronomy, McMaster University - Hamilton, Ontario, Canada L8S 4M1
4 The Canadian Institute for Advanced Research - Toronto, Ontario, Canada M5G 1Z8
Accepted: 28 June 2011
We consider a model of the pseudogap specifically designed to describe the underdoped cuprates and which exhibits particle-hole asymmetry. The presence of electron pockets, besides the usual hole pockets, leads to the appearance of new vectors beyond the usual so-called octet model in the joint density of states (JDOS), which underlies the analysis of Fourier-transform scanning tunneling spectroscopy (FT-STS) data. These new vectors are associated with distinct patterns of large amplitude in the JDOS and are expected to occur primarily at positive bias. Likewise a pseudogap Dirac point occurs at positive bias and this point can be determined either through FT-STS or through extrapolation of data from the autocorrelation function of angle-resolved photoemission spectroscopy.
PACS: 74.72.-h – Cuprate superconductors / 74.72.Kf – Pseudogap regime / 74.20.Mn – Nonconventional mechanisms
© EPLA, 2011
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